asp.net data matrix reader

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We ve focused on the Java Persistence standard in this book and discussed only a few examples of other EJB 3.0 programming constructs. We wrote some EJB session beans, enabled container-managed transactions, and used container injection to get an EntityManager. There is much more to be discovered in the EJB 3.0 programming model. In the following sections, we show you how to simplify some of the previous patterns with EJB 3.0 components. However, we again only look at features that are relevant for a database application, so you need to refer to other documentation if you want to know more about timers, EJB interceptors, or message-driven EJBs. First you ll implement an action in a web application with a stateful session bean, a conversational controller. Then you ll simplify data-access objects by turning them into EJBs to get container-managed transactions and injection of dependencies. You ll also switch from any Hibernate interfaces to Java Persistence, to stay fully compatible with EJB 3.0. You start by implementing a conversation with EJB 3.0 components in a web application.

If you do not have a Security tab on the Properties dialog box for your files and folders, you should first check to make sure that files and folders are located on a partition formatted as NTFS. You should also make sure that if your computer is not a member of a domain, you have turned off Simple File Sharing. To stop using Simple File Sharing, click Start, right-click My Computer, and then click Explore. On the Tools menu, click Folder Options. Click the View tab, clear Use Simple File Sharing (Recommended), and click OK.

4. In Advanced Security Settings For dialog box for the file or folder, click the Auditing tab. Click Add, select the users for whom you want to audit file and folder access, and then click OK. 5. In the Auditing Entry For dialog box for the file or folder, select the Successful check box, the Failed check box, or both for the events that you want to audit. For a list of the events that can be audited for folders, see Figure 16-13. Table 167 describes the user activity that triggers these events so you can determine when you should audit these events.

A stateful session bean (SFSB) is the perfect controller for a potentially long-running conversation between the application and the user. You can write an SFSB that implements all the steps in a conversation for example, a PlaceItem conversation:

16-42

16

1 2 3

Table 16-7

User Activity That Triggers the Event Running a program or gaining access to a folder to change directories Displaying the contents of a file or a folder Displaying the attributes of a file or folder Changing the contents of a file or creating new files in a folder Creating folders in a folder Changing attributes of a file or folder Deleting a file or subfolder in a folder Deleting a file or folder Viewing permissions for the file owner for a file or folder Changing permissions for a file or folder Taking ownership of a file or folder

Step 2 of this conversation can be executed repeatedly, if more than one image must be added. Let s implement this with an SFSB that uses Java Persistence and the EntityManager directly. A single SFSB instance is responsible for the whole conversation. First, here s the business interface:

Event Traverse Folder/Execute File List Folder/Read Data Read Attributes And Read Extended Attributes Create Files/Write Data Create Folders/Append Data Write Attributes and Write Extended Attributes Delete Subfolders And Files Delete Read Permissions Change Permissions Take Ownership

6. Click OK to return to the Advanced Security Settings For dialog box for the file or folder. By default, any auditing changes that you make to a parent folder also apply to all child folders and all files in the parent and child folders. 7. To prevent changes that are made to a parent folder from applying to the currently selected file or folder, clear the Inherit From Parent The Auditing Entries That Apply To Child Objects check box. 8. Click OK twice.

public interface PlaceItem { public Item createItem(Long userId, Map itemData); public void addImage(String filename); public void submit(); }